LONDON (AP) — Thousands more police officers  flooded London streets Tuesday in a bid to end Britain's worst rioting in a  generation as nervous shopkeepers closed early and some residents stood guard to  protect their neighborhoods. The unrest spread across central and northern  England on a fourth night of violence driven by poor, diverse and brazen crowds  of young people.
 Scenes of ransacked stores, torched cars and  blackened buildings frightened and outraged Britons just a year before London is  to host the summer Olympic Games, and brought demands for a tougher response  from law enforcement.
 London's Metropolitan Police department put  thousands more officers in the streets and said that by Wednesday there would be  16,000 — almost triple the number present Monday. Dozens of police were seen  combing through the Canning Town area of east London as officers hunted for  potential new flash points, but the department acknowledged it could not  guarantee an end to the violence.
 Though London saw no new unrest late Tuesday, but the chaos spread to other  cities. A police station in the central England city of Nottingham was  firebombed by a 40-strong mob, and hundreds of youths battled police in the  northwestern city of Manchester.
 Stores, offices and nursery schools across London closed early amid fears of  fresh rioting. Many usually busy streets had an eerie calm as cafes, restaurants  and pubs also decided to shut down for the night.
 Many shops had their metal blinds pulled down, while other business owners  rushed to secure plywood over their windows before nightfall.
 Some London residents prepared to defend their homes and stores. Outside a  Sikh temple in Southall, west London, residents stood guard and vowed to defend  their place of worship if mobs of young rioters appeared. Another group marched  through Enfield, in north London, aiming to deter looters.
 In east London's Bethnal Green district, convenience store owner Adnan Butt,  28, said residents were tense.
 "People are all at home — they're scared" of the rioters, he said.
 London's deputy assistant police commissioner Steve Kavanagh vowed that large  numbers of officers would remain on London's streets until calm was  restored.
 "We will continue with this additional policing for as long as is necessary.  Our priority remains protecting the public and restoring order to our streets,"  he said.
 In Nottingham, police said rioters had hurled firebombs though the window of  a police station in the Canning Circus area of the city, but that there were no  reports of injures. Eight men were arrested at the scene, where firefighters  doused a blaze.
 In Manchester, hundreds of youths rampaged through the city center, hurling  bottles and stones at police and vandalizing stores. A women's clothing store on  the city's main shopping street was set ablaze, along with a disused library in  nearby Salford. Looters targeted stores selling designer clothes and expensive  consumer electronics.
 Neither Manchester nor Nottingham had previously been involved in unrest.  There also was minor unrest for the first time in the central England locations  of Leicester, Wolverhampton and West Bromwich.
 Britain's riots began Saturday when an initially peaceful protest over a  police shooting in London's Tottenham neighborhood turned violent. That clash  has morphed into a general lawlessness in London and several other cities that  police have struggled to halt with ordinary tactics. While the rioters have run  off with sneakers, bikes, electronics and leather goods, they also have torched  stores apparently just for the fun of seeing something burn.
 Rioters, able to move quickly and regroup to avoid the police, have been left  virtually unchallenged in several neighborhoods, plundering stores at will.
 Police said they were considering the use of plastic bullets — blunt-nosed  projectiles designed to deal punishing blows to rioters without penetrating the  skin. Such weapons, formally called baton rounds, still are used to quell riots  in Northern Ireland but have never been used by police on Britain's  mainland.
 The government rejected calls by Conservative lawmaker Patrick Mercer and  some members of the public for strong-arm riot measures that British police  generally avoid, such as tear gas and water cannons.
 "They should have the tools available and they should use them if the  commander on the ground thinks it's necessary," Mercer said.
 Police did offer advice on what actions people could legally take to defend  homes from attack. "As a general rule, the more extreme the circumstances and  the fear felt, the more force you can lawfully use in self-defense," London's  police department said in advice circulated late Tuesday.
 In central England, police said they had made five new arrests amid violence  Tuesday in Birmingham — which also suffered rioting on Monday — and had  dispersed a small group of people who torched two cars in the center of West  Bromwich, a nearby town. About 20 people were arrested following rioting in the  central city of Wolverhampton, police said.
 Riots and looting has flared across London from gritty suburbs along the  capital's fringes to the posh Notting Hill neighborhood. The disorder has caused  heartache for Londoners whose businesses and homes were torched or ransacked,  and a crisis for police and politicians already staggering from a spluttering  economy and a scandal over illegal phone hacking by a tabloid newspaper that has  dragged in senior politicians and police.
 "The public wanted to see tough action. They wanted to see it sooner and  there is a degree of frustration," said Andrew Silke, head of the criminology  department at the University of East London.
 So far more than 560 people have been arrested in London and about 100  charged — including an 11-year-old boy — and the capital's prison cells were  overflowing. Several dozen more were arrested in other cities. The Crown  Prosecution Service said it had teams of lawyers working 24 hours a day to help  police decide whether to charge suspects.
 Silke said it will be hard to control the rioting until police make larger  numbers of arrests.
 "People are seeing images of lines of police literally running away from  rioters," he said. "For young people that is incredibly empowering. They are  breaking the rules. They are getting away with it. No one is able to stop  them."
 The unrest has been Britain's worst since race riots set the capital ablaze  in the 1980s. "No one should wake in this wonderful city of ours to see such  scenes of devastation and violence," Kavanagh said early Tuesday, as police and  lawmakers surveyed the damage.
 London's beleaguered police force noted that it had received more than 20,000  emergency calls on Monday — four times the normal number. Scotland Yard has  called in reinforcements from around the country and asked all volunteer special  constables to report for duty.
 A soccer match scheduled for Wednesday between England and the Netherlands at  London's Wembley stadium was canceled to free up police officers for riot duty.  Britain's soccer authorities said they were in talks with police to see whether  this weekend's season-opening matches of the Premier League could still go ahead  in London.
 Police launched a murder inquiry after a man found with a gunshot wound  during riots in the south London suburb of Croydon died of his injuries Tuesday,  and arrested three people on suspicion of the attempted murder of a police  officer hit by a car.
 A total of 111 officers and 14 members of the public had been hurt so far in  the rioting, including a man in his 60s with life-threatening injuries, police  said.
 Prime Minister David Cameron — who cut short a holiday in Italy to deal with  the crisis, reversing an earlier decision to remain on his vacation — recalled  Parliament from its summer recess for an emergency debate Thursday on the riots.  He described the scenes of burning buildings and smashed windows as "sickening,"  but refrained from tougher measures such as calling in the military to help  restore order.
 "People should be in no doubt that we will do everything necessary to restore  order to Britain's streets and to make them safe for the law-abiding," Cameron  told reporters after a crisis meeting at his Downing Street office.
 Other politicians visited riot sites Tuesday — but for many residents it was  too little, too late.
 Deputy Prime Minister Nick Clegg was booed by crowds who shouted "Go home!"  in Birmingham, while London Mayor Boris Johnson — who flew back overnight from  his summer vacation — was heckled on a shattered shopping street in Clapham,  south London.
 Johnson said the riots would not stop London from "welcoming the world to our  city" for the Olympics.
 "We have time in the next 12 months to rebuild, to repair the damage that has  been done," he said. "I'm not saying it will be done overnight, but this is what  we are going to do."
 Violence broke out late Saturday in the low-income, multiethnic district of  Tottenham in north London, after a protest against the fatal police shooting of  Mark Duggan, a 29-year-old father of four who was gunned down in disputed  circumstances Thursday.
 Police said Duggan was shot dead when officers from Operation Trident — the  unit that investigates gun crime in the black community — stopped a cab he was  riding in.
 The Independent Police Complaints Commission, which is investigating the  shooting, said a "non-police firearm" was recovered at the scene, but that there  was no evidence it had been fired — a revelation that could fuel the anger of  the local community.
 An inquest into Duggan's death was opened Tuesday, though it will likely be  several months before a full hearing.
 Duggan's death stirred memories of the 1980s, when many black Londoners felt  they were disproportionately stopped and searched by police. The frustration  erupted in violent riots in 1985, during which a police officer was stabbed to  death.
 Relations have improved since then, but tensions remain and many young people  of all races mistrust the police.
 Seeking explanations for the unrest, some pointed to rising social tensions  in Britain as the government slashes 80 billion pounds ($130 billion) from  public spending by 2015 to reduce the country's huge budget deficit, swollen  after the country spent billions bailing out its foundering banks.
 But many rioters appeared simply to relish the opportunity for unchecked  violence Monday night. "Come join the fun!" shouted one youth as looters hit the  east London suburb of Hackney.
 In Croydon, fire gutted a 140-year-old family run department store, House of  Reeves, and forced nearby homes to be evacuated. "No one's stolen anything,"  said owner Graham Reeves, 52. "They just burnt it down."
 Many Londoners emerged on Tuesday with brooms to help sweep the streets of  broken glass, rallying to the aid of those whose homes or premises had been  vandalized.
 The riots could not have come at a worse time for police — a year before the  Olympic Games, which Scotland Yard says will be the biggest challenge in its  182-year history.
 Cameron's government has slashed police  budgets under its austerity program. A report last month by Her Majesty's  Inspectorate of Constabulary said the cuts — a third of which have already taken  place — will mean 16,000 fewer police officers by 2015.
 Scotland Yard is also without a full-time  leader after chief Paul Stephenson quit last month amid a scandal over the ties  between senior officers and Rupert Murdoch's British newspapers, which are being  investigated for hacking phone voicemails and bribing police for information.  The force's top counterterrorism officer, John Yates, also quit over the hacking  scandal.
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 Jill Lawless, Danica Kirka, Meera Selva,  Sheila Norman-Culp and Stephen Wilson contributed to this report.
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